کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
257438 | 503589 | 2014 | 8 صفحه PDF | دانلود رایگان |
• Consumption of calcium hydroxide with red mud.
• Hydration compounds were formed in pastes with up to 15% of red mud.
• Red mud promoted the filling of the empty capillaries.
• Hydration products could be able to assume the fixation of contaminants.
Red mud (RM) is a by-product from aluminum industry, and represents a renewed environmental problem due the significant annual throughput by the plants. The investigation of the microstructure and mineralogical compositions of the cement pastes with up to 15% of dry or calcined RM (600–900 °C) were carried out using scanning electron microscopy, X-ray diffraction and differential thermal analysis techniques, respectively. The environmental evaluation of RM was performed using Toxicology Characteristic Leaching (TCLP) and diffusion tests in mortars. Water absorption by capillarity, wetting angle, compressive strength tests were carried out on mortars with up to 15% RM in replacement of cement. The compounds calcium silicate hydrate, AFm phase, CAH gel and ettringite were identified in the pastes produced with RM. The results showed that the RM waste can be used in replacement to cement to produce cementitious composites with microstructure, mechanical and hygroscopic properties suitable for their use in civil construction.
Journal: Construction and Building Materials - Volume 67, Part A, 30 September 2014, Pages 29–36